(Closed) Anyone had a dress made from scratch?

So last night a friend of my fiancées who is also becoming a friend of mine recently offered to make me my wedding dress. I was bowled over and really thrilled. She studied dress making and costume design at university and now makes dresses for a living. She has done pieces that have even been used in large theatre productions. She is a very talented lady. She said to drop her an email this week and we’ll start chatting but I’m a bit overwhelmed. I’ve spent time looking at dresses within a certain budget and somewhat limited by what’s on offer, and now I have the chance to have the dress I’ve dreamed about. But where do you start? How do you go about conveying your ideas to someone who will make your dress? Has anyone had their dress made for the, and had to start from scratch?